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Mandal A, Mondal S, Karmakar P, Mallick S, Bera BK, Ghosh AK. Mechanistic aspects of ligand substitution on [(H2O)(tap)2RuORu(tap)2(H2O)]2+ ion {tap = 2-(m-tolylazo)pyridine} by some amino acids in aqueous medium at physiological pH. INT J CHEM KINET 2012. [DOI: 10.1002/kin.20701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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MANDAL ARUP, MONDAL SUBALA, KARMAKAR PARNAJYOTI, BERA BIPLABK, MALLICK SUBHASIS, GHOSH ALAKK. Mechanistic aspects of ligand substitution on [(H 2 O)(tap) 2 RuORu(tap) 2 (H 2 O)] 2 + {tap=2-(m-tolylazo)pyridine} ion by three glycine-containing dipeptides in aqueous medium at physiological pH. J CHEM SCI 2012. [DOI: 10.1007/s12039-012-0245-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mandal A, Mallick S, Karmakar P, Bera BK, Mondal S, Ghosh AK. Kinetics and Mechanism of the Interaction of Glycyl-L-Leucine with [(H2O)(Tap)2Ruoru(Tap)2(H2O)]2+ Ion at Physiological Ph. PROGRESS IN REACTION KINETICS AND MECHANISM 2012. [DOI: 10.3184/146867811x13095334771654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The interaction of glycyl-L-leucine (L-I/H) with [(H2O) (tap)2RuORu(tap)2(H2O)]2+ (tap=2-(m-tolylazo) pyridine) has been studied spectrophotometrically in aqueous medium as a function of [(H2O) (tap)2RuORu(tap)2(H2O)2+], [glycyl-L-leucine], pH and temperature. The reaction was monitored at 600 nm where the spectral difference between the reactant and product is a maximum. At pH 7.4, the interaction with glycyl-L-leucine shows two parallel steps, i.e. it shows a non-linear dependence on the concentration of glycyl-L-leucine; both processes are ligand dependent. The rate constants for the processes are: kl 10−3 s 1 and K2∼10−5 s−1. The activation parameters calculated from Eyring plots are: Δ H#1 = 15.8∓0.6kJ mol−1, A Sf = −232 + 2J K 1 mol−1, AH2# =31.7∓3.5kJmol−1, AS* = −216∓ 10J K−1 mol−1. Based on the kinetic and activation parameters, an associative interchange mechanism is proposed for the interaction processes. from the temperature dependence of the outer sphere association equilibrium constant, the thermodynamic parameters were also calculated, which gave a negative AG° value for both the steps at all temperatures studied, supporting the spontaneous formation of an outer sphere association complex. The product of the reaction has been characterized from IR and ESI-mass spectroscopic analysis.
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Affiliation(s)
- Arup Mandal
- Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India
| | - Subhasis Mallick
- Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India
| | - Parnajyoti Karmakar
- Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India
| | - Biplab K. Bera
- Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India
| | - Subala Mondal
- Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India
| | - Alak K. Ghosh
- Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India
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Kinetic and Mechanistic Studies on the Reaction of DL-Methionine with [(H2O)(tap)2RuORu(tap)2(H2O)]2+ in Aqueous Medium at Physiological pH. Inorg Chem 2011. [DOI: 10.1201/b12873-17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Das(Karfa) T, Bera BK, Mallick S, Karmakar P, Mandal A, Mondal S, De GS, Ghosh AK. Kinetic and mechanistic studies on the reaction of thiosemicarbazide with [(H2O)(tap)2RuORu(tap)2(H2O)]2+ {tap = 2-(m-tolylazo)pyridine}. TRANSIT METAL CHEM 2010. [DOI: 10.1007/s11243-010-9408-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kinetic and mechanistic studies on the substitution of aqua ligands from cis-diaqua-bis-(bypyridyl)-ruthenium(II) ion by vic-dioximes. TRANSIT METAL CHEM 2009. [DOI: 10.1007/s11243-009-9185-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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